A/C Blues
Thread Starter
Instructor
Joined: Mar 2007
Posts: 153
Likes: 0
From: Waldorf MD
A/C Blues
Hey forum;
I have been working on my 98 coupe for some time now. After charging the system I noticed that once I put the proper amount of 134a in the system my ac clutch still would not kick in. I hooked up my scanner and;
P0530 A/C refrigerant pressure sensor circuit
P1545 A/C clutch relay control circuit a/c pressure
after reading extensive post here on the forum I havent found a sure test to rule out a hydro lock/ burnt compressor. Now I am presently working on what I believe to be OAT sensor, but when I follow form post to locate the 2 wire terminal I realized the orange wire is hot event without the key in the ignition. These are the photos of what I traced down to believe was OAT sensor, Im sort of at an impasse and would greatly appreciate any assistance from all that can help.
"There is nothing cool about a hot vette regardless of how good it looks"
I have been working on my 98 coupe for some time now. After charging the system I noticed that once I put the proper amount of 134a in the system my ac clutch still would not kick in. I hooked up my scanner and;
P0530 A/C refrigerant pressure sensor circuit
P1545 A/C clutch relay control circuit a/c pressure
after reading extensive post here on the forum I havent found a sure test to rule out a hydro lock/ burnt compressor. Now I am presently working on what I believe to be OAT sensor, but when I follow form post to locate the 2 wire terminal I realized the orange wire is hot event without the key in the ignition. These are the photos of what I traced down to believe was OAT sensor, Im sort of at an impasse and would greatly appreciate any assistance from all that can help.
"There is nothing cool about a hot vette regardless of how good it looks"
Instructor
Joined: Jun 2008
Posts: 233
Likes: 1
From: Austin Texas
Do you have any voltage on the clutch circuit? To start, I'd check the resistance across that connector. From your pics it looks corroded. If you can clean it up to have less than 5 ohms it's good to go, for now.
Also, check the clutch relay if you don't have power. Check the clutch ground if you do. Then check the pressure sensor circuit, etc. The sensor supposedly disengages clutch above 410psi or below 30psi on my '99. But I recall my system took about 3/4 charge before the compressor finally kicked on and began circulating the refrigerant.
Also, check the clutch relay if you don't have power. Check the clutch ground if you do. Then check the pressure sensor circuit, etc. The sensor supposedly disengages clutch above 410psi or below 30psi on my '99. But I recall my system took about 3/4 charge before the compressor finally kicked on and began circulating the refrigerant.
Last edited by Cratecruncher; Jul 11, 2011 at 10:39 AM.
Thread Starter
Instructor
Joined: Mar 2007
Posts: 153
Likes: 0
From: Waldorf MD
So im clear in my explanation, the first time I drove the vette this spring I noticed that my air didn't get cold. I put her away in the garage and recovered, Pulled a vacuum on the system, broke out my scale and proceeded to fill to 1.63 lbs as per the lable under the hood. I realized that my problem is electronic ie. Pressure sensor, O.A.T. sensor. Im not a master tech but more of a renasannce type of mech. I've just ordered ref. pressure sensor that should arrive in a couple of days. Oh and the corrosion pitted connector I have already cut. I would like to know if it is the outside air temp sensor, im confussed because the one orange wire is hot all the time.
Last edited by lumpdady; Jul 14, 2011 at 09:44 PM. Reason: adding photo's
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Thread Starter
Instructor
Joined: Mar 2007
Posts: 153
Likes: 0
From: Waldorf MD
Puzzled and perplexed
I purchased the OAT sensor and I cannot locate it. I have ruled out the plug that I have pictured above as it has to be the connection for my hood light. I have replaced the pressure switch. I removed the ram scoop that forces air up to and through the radiator, and no luck. None of the wires in that area seem to have been cut nor match the colors that you al provided me with. Im beginning to think that compressor/clutch is gone. Any suggestions on how to rule out my fears?
Racer
Joined: Jan 2011
Posts: 275
Likes: 2
From: Tucson Arizona
I have used a pair of jumper wires to provide 12V straight to the A/C compressor clutch. Do this while the engine is *not* running then you can hear the clutch kick in and out. The answer to your question will be obvious.